One way to remember the rules is to remember the standard "rock-paper-scissors" ordering, where each gesture defeats the one before it, and is defeated by the one after. But then add the two novel gestures near the word they approximately rhyme with:

Rock

Spock

Paper

Lizard

Scissors

In this expanded list, each gesture is defeated by the following two options, and defeats the preceding two.

But I feel the previous code is more clear. Sometimes, we must decide between having a clear code vs a clever one.